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轻松搞定python生成器

  • 2026-07-02 16:39:05
轻松搞定python生成器

轻松搞定python生成器

之前学 Python 生成器的时候，看到 yield 就懵了🤯
后来发现其实就是三点：
📌 生成器 = 懒人版迭代器
一次只产生一个值，不占内存
对比列表推导式：[x*x for x in range(1000000)] → 内存炸了
换成 (x*x for x in range(1000000)) → 丝滑如初✨
📌 yield 就是暂停键
普通函数 return 就结束了
生成器函数遇到 yield 就暂停，下次 next() 接着跑
省了一堆手动维护状态的代码👇
1. def fibonacci():

2. a, b = 0, 1

3. while True:

4. yield a

5. a, b = b, a + b

无限序列也不怕内存爆炸💥
📌 send() 还能往里传值
不只能一个一个取，还能往生成器里发数据
协程的核心原理就藏在这里👇
实测：处理 100w 条日志数据，生成器比列表少用 90% 内存 ✅
#Python #Python入门 #生成器 #编程干货 #测试开发 #自动化测试 #后端开发

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  1. CONNECT:[ UseTime:0.000661s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.019264s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000285s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000485s ]
  6. SELECT * FROM `set` [ RunTime:0.000518s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 495430 LIMIT 1 [ RunTime:0.002089s ]
  9. UPDATE `article` SET `lasttime` = 1783047524 WHERE `id` = 495430 [ RunTime:0.015263s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.007686s ]
  11. SELECT * FROM `article` WHERE `id` < 495430 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003558s ]
  12. SELECT * FROM `article` WHERE `id` > 495430 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000480s ]
  13. SELECT * FROM `article` WHERE `id` < 495430 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001432s ]
  14. SELECT * FROM `article` WHERE `id` < 495430 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002006s ]
  15. SELECT * FROM `article` WHERE `id` < 495430 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001228s ]
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